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 #include &lt;QtGui&gt;

 #include &quot;configdialog.h&quot;
 #include &quot;pages.h&quot;

 ConfigDialog::ConfigDialog()
 {
     contentsWidget = new QListWidget;
     contentsWidget-&gt;setViewMode(QListView::IconMode);
     contentsWidget-&gt;setIconSize(QSize(96, 84));
     contentsWidget-&gt;setMovement(QListView::Static);
     contentsWidget-&gt;setMaximumWidth(128);
     contentsWidget-&gt;setSpacing(12);

     pagesWidget = new QStackedWidget;
     pagesWidget-&gt;addWidget(new ConfigurationPage);
     pagesWidget-&gt;addWidget(new UpdatePage);
     pagesWidget-&gt;addWidget(new QueryPage);

     QPushButton *closeButton = new QPushButton(tr(&quot;Close&quot;));

     createIcons();
     contentsWidget-&gt;setCurrentRow(0);

     connect(closeButton, SIGNAL(clicked()), this, SLOT(close()));

     QHBoxLayout *horizontalLayout = new QHBoxLayout;
     horizontalLayout-&gt;addWidget(contentsWidget);
     horizontalLayout-&gt;addWidget(pagesWidget, 1);

     QHBoxLayout *buttonsLayout = new QHBoxLayout;
     buttonsLayout-&gt;addStretch(1);
     buttonsLayout-&gt;addWidget(closeButton);

     QVBoxLayout *mainLayout = new QVBoxLayout;
     mainLayout-&gt;addLayout(horizontalLayout);
     mainLayout-&gt;addStretch(1);
     mainLayout-&gt;addSpacing(12);
     mainLayout-&gt;addLayout(buttonsLayout);
     setLayout(mainLayout);

     setWindowTitle(tr(&quot;Config Dialog&quot;));
 }

 void ConfigDialog::createIcons()
 {
     QListWidgetItem *configButton = new QListWidgetItem(contentsWidget);
     configButton-&gt;setIcon(QIcon(&quot;:/images/config.png&quot;));
     configButton-&gt;setText(tr(&quot;Configuration&quot;));
     configButton-&gt;setTextAlignment(Qt::AlignHCenter);
     configButton-&gt;setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

     QListWidgetItem *updateButton = new QListWidgetItem(contentsWidget);
     updateButton-&gt;setIcon(QIcon(&quot;:/images/update.png&quot;));
     updateButton-&gt;setText(tr(&quot;Update&quot;));
     updateButton-&gt;setTextAlignment(Qt::AlignHCenter);
     updateButton-&gt;setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

     QListWidgetItem *queryButton = new QListWidgetItem(contentsWidget);
     queryButton-&gt;setIcon(QIcon(&quot;:/images/query.png&quot;));
     queryButton-&gt;setText(tr(&quot;Query&quot;));
     queryButton-&gt;setTextAlignment(Qt::AlignHCenter);
     queryButton-&gt;setFlags(Qt::ItemIsSelectable | Qt::ItemIsEnabled);

     connect(contentsWidget,
             SIGNAL(currentItemChanged(QListWidgetItem *, QListWidgetItem *)),
             this, SLOT(changePage(QListWidgetItem *, QListWidgetItem*)));
 }

 void ConfigDialog::changePage(QListWidgetItem *current, QListWidgetItem *previous)
 {
     if (!current)
         current = previous;

     pagesWidget-&gt;setCurrentIndex(contentsWidget-&gt;row(current));
 }</pre>
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